TWI772595B - Flat key profile for a lock-key system - Google Patents

Abstract

The invention relates to a flat key profile for a lock-key system, in which provision is made in the lock cylinder for a keyway which corresponds with the key profile. In this case, - the key profile of the key shaft has a profile section in facing relation to the back of the key and a lower profile section in facing relation to the key chest, - provision is made in the lower profile section in the one side face of the key shaft for a triangular paracentric profile groove (2) which extends beyond the center plane of the key shaft, - provision is made on the opposite side face of the key shaft for a triangular profile groove (3;4) arranged above or below the opposing paracentric profile groove (2) and having a profile base at a horizontal distance (8) to the profile base of the opposing paracentric profile groove, - the arrangement of the paracentric profile groove in relation to the opposing profile grooves is such that an imaginary line (7), which extends perpendicular to the key shaft plane from the point of intersection of the upper or lower leg of the paracentric profile groove with the key side face toward the opposing profile groove, has a vertical distance (9) to an imaginary line (5), which extends from the point of intersection of the upper or lower leg of the opposing profile groove with the key side face up to the paracentric profile groove.

Description

Flat key outline for lock key system

The present invention relates to a flat key profile for a lock-key system, wherein a flat keyhole for a corresponding key profile is provided in the lock core.

The term flat key also refers to a rib profile key or a lock rib profile key, ie a profile in which the rib protrudes beyond the sides of the key.

Keys are copied or copied for various reasons, among which a distinction is made between legal and illegal.

By using such a key profile involving a protected profile, ie one that has patent or novel protection, reproduction becomes difficult, or at least should become difficult.

Such keys can optionally be reordered via the key manufacturer or an authorized key service.

Conversely, there are known key services in a position where a replica machine can be used to produce a replica key with the protected profile itself. However, there are not so simple outlines that using a simplified approach Like the actual outline.

This concerns, for example, the shape of the transverse profile grooves.

Commercially available duplication machines use thin circular saw blades, which are only capable of performing rectangular cuts. When a V-shaped cut is required for replication, only a rectangular cut can be performed instead.

It is now an object of the present invention to make machine-based replication of key profiles difficult.

According to the invention, this object is achieved by a flat key profile for a lock-key system, wherein a flat keyhole is provided in the lock core for a corresponding key profile, wherein the key profile of the key shaft has a rear face facing the key. The side profile section and the lower profile section facing the key box, starting from the key box, a recess protruding in the lower profile section is provided in the key shaft plane, in the lower profile section in one side of the key shaft A triangular contour groove 2 beyond the centerline (paracentric) is provided in the segment, which extends beyond the center plane of the key shaft, and a triangular contour groove is provided on the opposite side of the key shaft, which is arranged on the opposite side beyond the centerline. above or below and having a profile bottom at a horizontal distance from the profile bottom of the opposite out-of-center profile groove, With respect to the opposite profile groove, the out-of-center profile groove is arranged such that the plane perpendicular to the key shaft extends from the intersection of the upper or lower leg of the out-of-center profile groove with the side of the key toward the opposite profile groove. There is a vertical distance between the imaginary line and the imaginary line extending from the intersection of the upper or lower leg of the opposing profile groove with the side of the key to the profile groove beyond the centerline.

An advantageous configuration is stated in the attached claim.

What is used are two profile features that are opposite each other and have a triangular (V-shaped) configuration. The profile feature is symmetrical and has a radius at its base.

When two opposing features are now arranged, for example, very close to each other when the profile is milled rectangularly, the key will break in this area. The minimum overlap shall be 0.2mm and the maximum residual thickness shall be 0.3mm. In order to be able to produce triangular cuts (profile features) in an economical way, the deeper cuts should have an angle of a=110°.

There must be at least two cuts in relatively offset relationship. Starting with a deeper cut, more cuts must therefore appear "above" or "below" this deeper cut.

As described above, since replication machines with rectangular milling blades cannot produce V-shaped profile grooves, the profile grooves must be milled rectangularly to necessarily become wider.

However, since according to the invention more interrelationships or features in the arrangement have to be observed, the key shaft thus becomes too thin in certain areas, so that the key shaft breaks during the reproduction process or at the latest during use.

Therefore, the disadvantages of mechanical profile copying machines are exploited so that the The key becomes unusable.

Likewise, with replication of filaments - 3D printing, it is obviously more difficult due to bevels, since bevels here can only be created in layers.

1: key shaft

2: Contour groove

3: Contour groove

4: Contour groove

5: Dotted line (imaginary line)

6: Dotted line

7: Dotted line (imaginary line)

8: (horizontal) distance

9: (vertical) distance, (vertical overlap)

10: Shoulder

11: Shoulder

12: Shoulder

13: Shoulder

a: angle

b: angle

R: radius

The present invention will be explained in more detail below with reference to the drawings.

It is shown here that Figure 1 is a partial side view of a key with a bow and a profiled shaft, Figure 2 is a section through the profiled shaft, and Figure 3 is a section of a modified embodiment.

The key shaft is represented by 1. Extending from the side of the key is a deeper profile groove 2 that extends beyond the centerline beyond the center plane. The profile grooves 2 are arranged symmetrically and have an angle α(a). Similarly, on the other side of the key, the profile grooves are arranged "above" and "below" the profile groove 2 . These profile grooves are denoted by 3 and 4 and have an angle β(b). A radius (R) is formed on the bottom of the cut. Drawn around the three cuts with dashed lines 5, 6, 7 are corresponding rectangles that trace the rectangular cuts using a mechanical outline duplication machine.

With respect to the oppositely arranged contour grooves, the contour grooves beyond the centerline are arranged so that there is a vertical distance 9 between an imaginary line 7 and an imaginary line 5, the imaginary line 7 being perpendicular to the key shaft plane from the upper part of the contour groove beyond the centerline. feet or The intersection of the lower leg and key flank extends towards the opposite profile groove, imaginary line 5 is the profile groove extending from the intersection of the upper or lower leg of the opposite profile groove with the key flank to beyond the centerline.

Therefore, horizontal and vertical distances are established here. The maximum horizontal distance 8 should be 0.3mm, and the minimum vertical overlap 9 should be equivalent to 0.2mm.

The angle a from the deeper cut should correspond to 110°. The radius R should be equivalent to 0.2mm.

b

100°。 The angle b can be freely selected according to the distances 8 and 9. The angle b is variable and is 130°

b

100°.

Preferably, the cutout (profile feature) should be located in the "lower" area of the key, ie, the notch from the key box.

The triangular contoured groove (2) beyond the centerline has at least one shoulder (13) in the upper leg which is opposite to the shoulder (10) in the lower leg of the upper triangular contoured groove (3) ), or the shoulder (12) in the lower leg, which is associated with the shoulder (11) in the upper leg of the opposite triangular profile groove (4) in the lower part, wherein the shoulder Starts at the imaginary intersection of the triangular profile groove with the outer surface of the key and has a minimum depth of 1/3 of the triangular profile groove.

The shoulders (10-13) have a symmetrical or asymmetrical depth.

1‧‧‧Key shaft

2‧‧‧Profile groove

3‧‧‧Profile groove

4‧‧‧Profile groove

5‧‧‧Dotted line (imaginary line)

6‧‧‧dotted line

7‧‧‧Dotted line (imaginary line)

8‧‧‧(horizontal) distance

9‧‧‧(vertical) distance, (vertical overlap)

a‧‧‧angle

b‧‧‧angle

R‧‧‧Radius

Claims (9)

A flat key profile for a lock-key system, wherein a flat keyhole is provided in the lock core for the corresponding key profile, characterized in that the key profile of the key shaft has a profile area facing the rear side of the key segment, and a lower profile section facing the key box, starting from the key box, a recess protruding in the lower profile section is provided on the key shaft plane, in one side of the key shaft in the lower profile area A triangular profile groove (2) beyond the centerline is provided in the segment, which extends beyond the central plane of the key shaft, and a triangular profile groove (3; 4) is provided on the opposite side of the key shaft, which is arranged on the opposite side of the key shaft. Above or below the contour groove (2) beyond the centerline, and having a contour bottom at a horizontal distance (8) from the contour bottom of the opposite contour groove beyond the center line, with respect to the opposite contour groove, the beyond The contour grooves of the centerline are arranged such that there is a vertical distance (9) between the imaginary line (7) and the imaginary line (5), the imaginary line (7) being perpendicular to the key shaft plane from the upper part of the contour groove beyond the centerline or the intersection of the lower leg and the side of the key extends towards the opposite profile groove, an imaginary line (5) extending from the intersection of the upper or lower leg of the opposite profile groove with the side of the key until the point beyond the centerline. Contour groove; the contour groove (2) of the triangle beyond the center line has at least one shoulder (13) in the upper leg, which is opposite to the triangle in the upper part The shoulder (10) in the lower leg of the profile groove (3) is associated, or the shoulder (12) in the lower leg, which is opposite to the lower part of the triangular profile groove (4) A shoulder (11) in the upper foot is associated, wherein the shoulder starts at the imaginary intersection of the triangular profile groove with the outer surface of the key and has a minimum depth of 1/3 of the triangular profile groove. The flat key profile of claim 1, wherein the depth of the individual recesses extends to the bottom of the profile facing the lowermost profile groove of the key box. The flat key profile of claim 1, wherein the profile grooves (2-4) have a radius (R) in the bottom of the profile. The flat key profile of any one of claims 1 to 3, wherein the angle a between the upper or lower leg of the contour groove (2) beyond the centerline and the side of the key is equivalent to 110 °. The flat key profile of any one of claims 1 to 3, wherein the angle b between the upper or lower leg of the opposing profile groove and the side of the key is variable and is 130°

b

100°. The flat key profile of any one of claims 1 to 3, wherein the horizontal distance (8) is at most 0.3mm, and the vertical distance (9) is at least 0.2mm. The flat key profile of any of claims 1 to 3, wherein the shoulders (10-13) have a symmetrical or asymmetrical depth. The flat key profile of any one of claims 1 to 3, wherein profile grooves are provided above and below the opposing profile grooves beyond the centerline. The flat key profile of any of claims 1 to 3, wherein shoulders (10-13) are provided on all triangular profile grooves.

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